I stayed over a month at Chiến’s condo in Thong Lo and loved it. It’s down a newly paved, quiet road between Thong Lo and Ekamai BTS stations; it is remarkably quiet and peaceful, even though it’s close to major nightlight areas. It’s about 8-10 minutes walking to BTS, and there are two 7-11’s within 5 minutes walking. And endless restaurants, especially Japanese and Thai.
The one-bedroom condo is spacious and has TWO balconies, both West facing. The kitchen is well supplied. The memory-foam mattress is the most comfortable I’ve slept on outside of my own bed back home. The internet is blazing fast (I clocked 350+ Mbps up and down), which Chiến had installed during my stay when the original wifi turned out to be insufficient. The washing machine is wash-only, but there's a drying rack on the balcony. The shower water pressure is good; it weakens as you max out the heat, but that’s probably too hot for humans to shower in anyway.
Chiến was an exceptional host, I definitely recommend.